[PATCH v3 0/3] Add Luckfox Omni3576 Carrier Board support for RK3576

[John Clark <inindev@gmail.com>]

This series adds device tree support for the Luckfox Omni3576
Carrier Board with the Core3576 Module, powered by the Rockchip
RK3576 SoC (four Cortex-A72 cores, four Cortex-A53 cores, Mali-G52
MC3 GPU). It enables essential functionality for booting Linux and
basic connectivity, with plans for future support of peripherals
like WiFi, MIPI-DSI, HDMI, and Ethernet.

The series was first posted as v1 at:
https://lore.kernel.org/linux-rockchip/20250502205533.51744-1-inindev@gmail.com
v2 at:
https://lore.kernel.org/linux-rockchip/20250504102447.153551-1-inindev@gmail.com

Tested features (on Linux 6.15-rc4):
 - UART: Serial console operational
 - SD card: Mounts and reads/writes successfully
 - PCIe: NVMe SSD detected, mounted, and fully functional
 - USB 2.0: Host ports operational
 - RTC: Timekeeping and wake-up tested
 - LED: Heartbeat trigger functional
 - eMMC: Enabled in device tree, not populated on tested hardware

The series includes three patches:
 1. dt-bindings: vendor-prefixes: Add Luckfox vendor prefix
 2. dt-bindings: arm: rockchip: Add Luckfox Omni3576 and Core3576 bindings
 3. arm64: dts: rockchip: Add Luckfox Omni3576 board support

The device tree is covered by the existing ROCKCHIP ARCHITECTURE
entry in MAINTAINERS. I am aware of ongoing RK3576 upstreaming
efforts (e.g., by Collabora) and welcome feedback or collaboration
to align with mainline driver development.

Changes in v3:
 - Addressed Jonas Karlman's feedback on patch 3/3
   (Luckfox Omni3576 device tree):
   - Added pinctrl for green LED GPIO (gpio1 RK_PD5) for proper
     pin setup.
   - Reordered regulator node properties for consistent sequence
     (e.g., regulator-name, regulator-min-microvolt,
     regulator-max-microvolt, etc.).
   - Updated regulator nodes (vcc_3v3_pcie, vbus_5v0_typec,
     vcc_5v0_host, vcc_5v0_hdmi) to use 'gpios' property instead
     of deprecated 'gpio'.
   - Removed pmic-power-off pinctrl state and pinctrl-1 from RK806
     PMIC node, as they are vendor-specific and undocumented in
     bindings.
   - Removed pwrkey node from PMIC, as it lacks binding
     documentation.
   - Added blank line between properties and child nodes in i2c2
     node for DT style compliance.
   - Removed no-mmc property from sdmmc node to enable MMC
     support, aligning with RK3576 SD v3.0 and MMC v4.51
     capabilities, allowing TF card slot to support MMC devices
     or eMMC via adapter.
 - Removed Ethernet support (gmac0/gmac1 nodes) per Andrew Lunn's
   feedback, as it relied on the generic PHY driver with incorrect
   RGMII delay settings, which would break with the upcoming
   MAE0621A driver.
 - Addressed Rob Herring's DTB check warnings, other warnings
   (e.g., VOP, PCIe, OTP, HDMI PHY) originate from rk3576.dtsi and
   are outside this patchset scope.
 - Added RNG node to pick up Nicolas Frattaroli's "add RK3576 RNG
   node" patch

Changes in v2:
 - Enabled HDMI node per feedback from Heiko Stuebner and Nicolas
   Frattaroli; untested due to upstream driver issues.
 - Enabled Ethernet 1 node per Heiko's device tree philosophy;
   untested due to suspected PHY driver or configuration issues
   (removed in v3 per Andrew Lunn).
 - Clarified eMMC remains enabled but unpopulated on tested
   board, per Heiko.

Signed-off-by: John Clark <inindev@gmail.com>
---
John Clark (3):
  dt-bindings: vendor-prefixes: Add luckfox prefix
  dt-bindings: arm: rockchip: Add Luckfox Omni3576 and Core3576 bindings
  arm64: dts: rockchip: Add Luckfox Omni3576 Board support

 .../devicetree/bindings/arm/rockchip.yaml     |  10 +
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 arch/arm64/boot/dts/rockchip/Makefile         |   1 +
 .../dts/rockchip/rk3576-luckfox-core3576.dtsi | 683 ++++++++++++++++++
 .../dts/rockchip/rk3576-luckfox-omni3576.dts  |  53 ++
 5 files changed, 749 insertions(+)
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3576-luckfox-core3576.dtsi
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3576-luckfox-omni3576.dts

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